JSFiddle - React, Tailwind, and code Playground

HTML

<html>
<div id="popup"  class="popup">
           <div id = "poupContentLine1" class="poupContentLine">
                HAI
           </div>
           <div id = "poupContentLine2" class="poupContentLine">
                <input type="submit" name="ctl00$detailContentPlaceholder$btnClose" value="CLOSE" id="detailContentPlaceholder_btnClose" />
           </div>
    </div>
</html>

CSS

.popup 
{
    width:530px;
    background-color:#ffffff;
    border:3px solid Yellow;
    padding: 10px 5px 10px 5px;
    margin: 0;
    text-align:center;
}